A voltage equalization switching control method for capacitors in a voltage-type high-voltage reactive power generator

Abstract

The invention discloses a voltage equalization switching control method for capacitors in a voltage-type high-voltage reactive power generator. The switching system theory is used to establish the volt-second characteristic curve of capacitor charging and discharging including temperature, time, maintenance, material and other influencing factors. And the watt-second characteristic model, which can fully, truly, whole-process, and finely understand the behavior characteristics of the anti-capacitor, and use the optimal switching control method to establish the mathematical model of the bridge arm switching algorithm, the bridge arm sub-module switching optimization mathematical model and the sub-module working mode switching model , can not only obtain capacitor voltage equalization under complex conditions, but also simply and efficiently generate PWM signals for output control of modular high-voltage reactive power generators, eliminate technical problems of uncontrollable components, improve control accuracy, and simplify the controller. Designed to achieve a good combination of high efficiency, economy, reliability and high precision, it has a wide range of practicability and is of great value in engineering applications.

Description

technical field [0001] The invention relates to the related technical field of capacitor voltage equalization control in a power system, in particular to a voltage equalization switch control method for capacitors in a voltage-type high-voltage reactive power generator. Background technique [0002] Capacitor is one of the most basic components of modular high voltage reactive power generator. The sub-module capacitor of the modular high-voltage reactive power generator is used as the energy storage element of the modular high-voltage reactive power generator. Due to the fluctuation of the capacitor energy storage, the capacitor voltage will inevitably fluctuate to a certain extent. The fluctuation of the sub-module capacitor voltage will cause the same phase. The instantaneous power fluctuation of the sub-module capacitors of the upper and lower bridge arms is asynchronous, which in turn affects the normal operation of the sub-modules of the upper and lower bridge arms in t...

AI Technical Summary

Problems solved by technology

However, when the number of sub-modules of the modular high-voltage var generator is very large, the amount of calculation for the sorting calculation of this traditional sorting-based nearest level modulation capacitor voltage equalization control method increases exponentially, which poses a challenge to the control technology and hardware design. bring difficulties

In addition, this type of method fails to fully, truly, whole-process, and finely consider the uncertain and nonlinear characteristics of capacitors when performing sorting calculations, and there are uncontrollable components, which make it difficult to show excellent capacitor voltage equalization control Effect

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